Kimmy has always been a threat in the higher tiers. Mostly banned in Legend but not quite in Mythic though. There are a lot of factors why she gets banned in Legend, the tier consists of powerful marksman while in Mythic its more on banning setters like Kaja and Chou but those two will be on a seperate topic. Kimmy can either be Mage or Marksman as we all know, a hybrid. A hero with a complex build consisting of Physical and Magical items. Reviewing Top Global Kimmy users, they all play with their squad which is a good thing and usual for top players, on the other hand. Solo queue players aren't in a comfortable state.
Harith has been nerfed in the lastest patch but will get buffed "a little". The nerf of his ult drastically changes the threat that he bring towards the game. Might not be true because players always improvise with the changes. Slow effect is also annoying than nothing at all. Anyways, he still got high mobility than other Mages and compared to Kimmy, Harith has the upper hand in terms of it. Heres a gameplay from the Top Harith player after the nerf has been released. By the way, having a squad really boost up the chances of winning every game.
I rather meet Harith then Kimmy because she's way to mobile and harder to catch because she can move and reaping my health when I tried to get close and with purify spell she's basically a no no to catch for all CC hero
While Harith, on the other hand, he still can handle especially the nerf on his ultimate is really game changer to engage and disengage with Harith